References

· Auvil, Daniel L. Calculus, with applications. Addison-Wesley Publishing Company, Inc., 1982.

· Bermant, A. F. and Aramanovich, I. G. Mathematical Analysis. Moscow, Mir Publishers, 1975.

· Piskunov, N. Differential and integral calculus. Moscow, Peace Publishers.

· Protter, Murray H. and Morrey, Charles B. Calculus for college students (second edition). Addison-Weseley Publishing Company, Inc.

· Purcell, Edwin, J. Calculus with analytic geometry. Englewood Cliffs, N.F. 07632, Prentice Hall, Inc., 1965.

· Salt, Laura E. Oxford Junior Encyclopedia. London, Oxford University Press, 1956. Part V.

· Shenk, Al. Calculus and analytic geometry. Santa Monica, California: Goodyear Publishing Company, Inc., 1977.